Xcode 4 iOS Development Tutorial: Flashlight App

Published: 23 March 2014
on channel: Karilril Chroawhat

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In this tutorial I help people wanting to get into iOS development build a very basic Flashlight App. I am hoping this will help people realize creating iOS applications is not as hard as they think. This is also a good way to get an introduction to Objective-C. If you are like me then you want to build something real and learn the theory as you go. That is why we are going to start by building a Flashlight App.

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For source code and step-by-step instructions please visit: http://goo.gl/t4jwfa

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iOS (previously iPhone OS) is a handheld OS developed and circulated by Apple Inc.
Initially unveiled in 2007 for the iPhone, it is often expanded to aid other Apple devices like the Ipodtouch (September 2007), iPad (January 2010), iPad Mini (November 2012) and 2nd-generation Apple Television on (September 2010). Unlike Microsoft's Windows Phone and Google's Android, Apple will not license iOS for setup on non-Apple hardware.

As of October 2013, Apple's Appstore featured more than 1 million iOS programs, 500,000 which were optimized for iPad. These apps have collectively been downloaded over 60 billion occasions. It had a 2-1% share of the smart-phone mobile operating-system units sent in the fourth quarter of 2012, behind Google's Android. From the center of 2012, there were 410 million devices activated. Based On the particular media event held by Apple on September 12, 2012, 400-million devices have been sold by June 2012.

The graphical user interface of iOS is based on the theory of direct manipulation, utilizing multi-touch gestures. Interface control parts contain sliders, switches, and buttons. Interaction with the OS comprises gestures such as swipe, pat, pinch, and reverse pinch, which have particular definitions within the context of the iOS operating system and its multi-touch-interface. Internal accelerometers are employed by some programs to reply to shaking the device (one frequent result is the reverse command) or rotating it in three measurements (one frequent result is changing from portrait to landscape mode).

iOS is derived from OSX, with which it shares the Darwin foundation and various application frameworks.

Leading variants of iOS are introduced annually. The current release, iOS 7, premiered on September 18, 2013. In iOS, there are four abstraction layers: Center OS level, the Core Services layer, the Media stratum|the Media level, the Core Services level, the Center OS level}, as well as the Cocoa Touch layer|the Cocoa Touch level, the Core Services layer, the Media layer, along with the Center OS level}. The current variant of the OS (iOS 7.0.6), dedicates 1-1.5 GB of the unit's flash memory for the method partition, using approximately 800 MB of that partition (varying by design) for iOS itself. It works on the I-phone 4 and later, 2nd-generation iPad and after, all models of the Ipadmini, along with the 5th-generation iPod Touch.

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